Keystones — Lintel
Five GCSE retrieval questions · 19 May 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 997 + 525
Answer: 1522 -
2. Algebra
Factorise: 3x² + 2x
Answer: x(3x + 2) -
3. Geometry
Calculate the area of a right triangle with perpendicular sides 10cm and 10cm
Answer: 50cm² -
4. Ratio
Simplify: 10:6:4
Answer: 5:3:2 -
5. Statistics
A bag has 5 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 5⁄11